These lock-nuts secure the factory GM LS windage trays or Improved Racing crankshaft scrapers to the factory main studs.
The nut is a Class 10 flange nut with M8x1.25 threads and meets or exceeds the factory specification lock-nut (GM part # 11609746).
Most LS and Vortec family engines require 10 lock-nuts to secure the windage tray. The F-Body oil pan and Holley 302-2 oil pan use shortened windage trays, requiring 8 lock-nuts.
Sold individually or in packs of 10 (choose above).
Features and Benefits
Opposing trident locking impressions resist loosening from vibration
Class 10 flange nut holds a proof load of 8500 lbs (38 kN)
Meets or exceeds the factory specification GM windage tray lock-nuts
Zinc-plated for corrosion resistance
* By design, each time the nut is installed and removed the locking ability of the nut is minimally reduced. It is recommended to replace the nuts after 5 complete install/uninstall cycles to maintain maximum locking performance.